The level of charges and who specifically will be charged is not clear, Christine said.

More than 30 members of Pi Delta Psi were conducting a ritual outdoors for new pledges called the "glass ceiling," according to a probable cause affidavit obtained by CNN.

The objective was for Deng, who was blindfolded and wearing a backpack filled with a 20-pound bag of sand, to navigate toward someone who was calling for him "while other fraternity brothers physically prevent that from happening," witnesses said, according to the affidavit.

Deng fell backward, struck his head and was unconscious and unresponsive immediately after he fell, the document states.

Other members of the fraternity told authorities they saw Deng get pushed but did not see who did it because it was dark in the yard of the residence where the ritual took place, the affidavit said. Later, three fraternity members drove Deng to a Pennsylvania hospital early on the morning of December 8, authorities said.

"The transport was done in a private vehicle ... which means this poor victim wasn't receiving any medical attention until the time he actually made it to the hospital," Christine said.

He was unresponsive and in critical condition upon his arrival at the hospital. Physicians determined Deng had suffered major brain trauma, and he was put on life support, according to the district attorney's office.